Feed collet



Jan. 19, 1932.

J. M. LUERS 1,842,036

FEED COLLET Filed Dec. 13. 1929 INVENTOR J57? lWIZZO/Z lzz e415 i T' ORNEY Patented Jan. 19, 1932 1,842,036

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JOHN MILTON L'U'ER-S, OF DETROIT, MICHIGAN FEED COLLET Application filed December 13, 1929. Serial No. 413,808.

This invention relates to improvements in Figure 2 is a section on the line 22 of Figfeed collets or pushers intended primarily for ure 1. use in automatic machines having hollow Figures 3 and e are end and side views of spindles through which bars of stock extend the bushing. and are intermittently fed forward. These ldeferring to the drawings, 1 designates a 5" feed collets or pushers are employed from housing consisting of a sleeve 2 and a cap 3. time to time to move the stock forward when Une end & of the sleeve 2 is usually externot otherwise held, so that another portion nally threaded for attachment to an operattnereof projects through the hollow spindle. ing 'member'therefor. The opposite end of Pieretofore it has been customary to prothe sleeve 2 is also externally threaded at 5 vide feed collets with portions sufficiently reto cooperate with internal thread 6 in the bore silient to grip the stock and move it longituof the cap 3. Thus that portion of the bore dinally. It is found, however, that the 8, of the sleeve 2 is of lesser diameter than spring tension of the resilient portions rapidthe bore of the cap 3 which fits over it. Inly diminishes until the collet will no longer tegral with the outer end of the cap 8 is an perform its function. inturned annular flange 7 This invention aims to provide a feed l/Vithin the housing 1 a bushing 9 is arcollet or pusher wherein a bushing, adapted ranged. This bushing is usually split as to encircle the stock, is slidably arranged in shown in Figures 2 and 3 and in that case is a housing so that when the latter is moved usually cut radially on its inner side dia '1 in the direction in which the stock is to be metrically opposite the split portion as moved a portion of the bore of the housing shown at 10 to render it more readily flexible. of reduced diameter contact the periphery The periphery of the bushing is generally of the bushing and causes the bore of the longitudinally tapered. The bore 8 of the latter to contract and grip the stock sufl'icientsleeve is of uniform diameter throughout its ly to move it with the housing and bushing. length as shown in Figure 1. The inturned Another object of the invention is to proflange 7 holds the bushing 9 against disenvide a feed collet wherein the bore of the gagement from the housing. housing is of larger size towards its opposite When the housing is moved in the direcend so that when the collet is moved in the tion of the arrow A, Figure 1, it advances rel- 550 direction opposite to that in which the stock ative to the bushing 9 until the tapered pcis fed the bushing is free to assume its norriphery of the latter enters the sleeve bore'8 mal size when it slides freely over the stock. far enough for the bushing to be pressed in- I p A further object of the invention is to prowardly sufficiently to engage the work 13 vide a bushing for such a feed collet that is Then the housing and bushing move together simple and cheap to manufacture, and which, and carry the work with it. When the houswhile flexible enough to be easily caused to ing is moved in the opposite direction the engage the stock by peripheral pressure, will bushing 9 is moved by the flange 7, and as the Hi release the latter and reassume its normal size bore of the cap .3 is of larger diameter, and

and shape as soon as that peripheral pressure also as the small end only of the bushing 9 ceases, so that no great resilience is required is then within the sleeve bore 8 the said for its successful operation. bushing has re-assunied its normal diameter Nith these and other objects and advanand is therefore free to move with the houstages in view which will become apparent as ing while the work remains stationary. the specification proceeds, the invention is From the foregoing it will be seen that the hereinafter more fully described with the aid function of the bushing 9 is such that only of the accompanying drawings, in which: sutlicient flexibility is required to permit it Figure 1 illustrates a sectional view of the to be flexed to grip the work by peripheral in invention with a piece of stock extending pressure exerted thereon. The bushings through it. may therefore be used successfully for an indefinite period; may be renewed at a minimum of cost due to the simplicity of their construction; and can be quickly inserted by merely removing the cap 3 from the sleeve 2.

Vhile in the foregoing the preferred embodiments of the invention have been described and shown it is understood that such further alterations and modifications may be made in the construction as fall within the scope of the appended claim.

What I claim as my invention and desire to secure by Letters Patent is:

A feed collet comprising a tubular housing having a removable end cap, the inner peripheral wall of the housing and cap being formed to provide a bore having three progressively stepped portions of increasing diameter, a split externally tapered bushing arranged to slidably fit in the intermediate bore portion, the bore of said housing and said bushing arranged to axially receive a bar of stock, whereby to permit the stock to move axially in one direction relative to the housing and bushing to make a narrow line contact with said bushing and compress the latter into frictional engagement therewith when the stock is moved in the opposite direction, and means on said cap for movably maintaining said bushing within the housing.

JOH N MILTON LUERS. 

